Tough, P. (2012). How children succeed: Grit, curiosity, and the hidden power of character. Houghton Mifflin Harcourt.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTough, Paul. How Children Succeed: Grit, Curiosity, and the Hidden Power of Character. Boston: Houghton Mifflin Harcourt, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTough, Paul. How Children Succeed: Grit, Curiosity, and the Hidden Power of Character. Houghton Mifflin Harcourt, 2012.
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